Cosmetic brush



FIG. 1 is a front and right side perspective view of a first embodiment of my new design for a cosmetic brush;

FIG. 2 is a front elevation view of the cosmetic brush shown in FIG. 1;

FIG. 3 is a right side elevation view of the cosmetic brush shown in FIG. 1;

FIG. 4 is a left side elevation view of the cosmetic brush shown in FIG. 1;

FIG. 5 is a rear elevation view of the cosmetic brush shown in FIG. 1;

FIG. 6 is a top plan view of the cosmetic brush shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the cosmetic brush shown in FIG. 1. 

CLAIM The ornamental design for a cosmetic brush, as shown. 